php 视频压缩ffmpeg $save_dir=storage_path('app') .'/public/'.mt_rand(99,999) .time() .'_video'.".mp4";//保存原视频$out_dir=storage_path('app') .'/public/'.mt_rand(99,999) .time() .'_smallVideo'.".mp4";//压缩后的视频$rs_video=$this->reduceVideo($oss_url,$out_dir,$...
Reduce fluctuations in QP (before curve compression) [20.0] –qblur (x264) -qblur (FFmpeg) Reduce fluctuations in QP (after curve compression) [0.5] –zones /(x264) UNKNOWN (FFmpeg) Allows setting a specific quantizer for a specific region of video. –qpfile (x264) UNKNOWN (FFmpeg) Al...
Step 2Customize video compression settings To reduce the size of the file, you can change the format, resolution, bit rate, and frame rate of the added video. You can also move the progress bar to automatically change the compression level. ...
$ffmpeg-re-iinput.mp4-ccopy-fhls-bsf:vh264_mp4toannexboutput.m3u8 因为默认是 HLS 直播,所以生成的 M3U8 文件内容会随着切片的产生而更新。这里多了一个-bsf:v h264_mp4toannexb参数,它的作用是将 MP4 中的 H.264数据转换为 H.264 AnnexB 标准的编码,AnnexB 标准的编码常见于实时传输流中。如果源...
✅ Option 2: Make FFmpeg reduce video size by downscaling resolution Command: ffmpeg -i input.mp4 -vf scale=720:480 -c:a copy downscale.mp4 Result size:46.4MB downscale.mp4 ✅ Option 3: Make FFmpeg reduce file size by lowering the bitrate ...
In this example we will reduce the resolution of a video in HD format (1920x1080 pixels) to 640x360 (this is a fairly used configuration for aspect ratio 16:9): ffmpeg -i video_1920.mp4 -vf scale=640:360 video_640.mp4 -hide_banner ...
通过 av_reduce 计算得到,PAR * SAR = DAR,其中 PAR 是 Pixel Aspect Ratio,表示单个像素的宽高比,大多数情况像素宽高比为 1:1,也就是一个正方形像素,如果不是 1:1,则该像素可以理解为长方形像素。 pix_fmt:像素格式,对应 av_get_pix_fmt_name(AVStream->codecpar->format)。 level:编码参数,对应AV...
一、前言 FFmpeg的Static版本的bin文件夹中只有三个.exe文件,分别是: ffmpeg.exe、ffplay.exe、ffprobe.exe,这三个是FFmpeg源代码编译后生成的可执行文件,也就是FFmpeg的三大工具,本文章主要介绍ffmpeg。 ffm…
这段指令,将视频流 video stream 从input.webm 直接复制到新的容器output.mkv , 然后对 音频流audio stream 按照 flac 规则进行编码。 1.5 修改container(容器/格式) 就像上面提到的,我们可以仅仅改变容器,实际上,就是转换格式: $ ffmpeg -i input.webm -c:av copy output.mkv ...
-cplxblur <float> E..V... Reduce fluctuations in QP (before curve compression) (from -1 to FLT_MAX) (default -1) -partitions <string> E..V... A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all -direct...